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From: Saurabh Sengar <ssengar@linux.microsoft.com>
To: tglx@linutronix.de, mingo@redhat.com, bp@alien8.de,
	dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com,
	kys@microsoft.com, haiyangz@microsoft.com, wei.liu@kernel.org,
	decui@microsoft.com, arnd@arndb.de, tiala@microsoft.com,
	mikelley@microsoft.com, linux-kernel@vger.kernel.org,
	linux-hyperv@vger.kernel.org, linux-arch@vger.kernel.org
Subject: [PATCH v3 5/5] x86/Kconfig: Add HYPERV_VTL_MODE
Date: Mon, 20 Mar 2023 03:03:38 -0700	[thread overview]
Message-ID: <1679306618-31484-6-git-send-email-ssengar@linux.microsoft.com> (raw)
In-Reply-To: <1679306618-31484-1-git-send-email-ssengar@linux.microsoft.com>

Add HYPERV_VTL_MODE Kconfig flag for VTL mode.

Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
---
 arch/x86/Kconfig         | 24 ++++++++++++++++++++++++
 arch/x86/hyperv/Makefile |  1 +
 2 files changed, 25 insertions(+)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 453f462f6c9c..c3faaaea1e31 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -782,6 +782,30 @@ menuconfig HYPERVISOR_GUEST
 
 if HYPERVISOR_GUEST
 
+config HYPERV_VTL_MODE
+	bool "Enable Linux to boot in VTL context"
+	depends on X86_64 && HYPERV
+	default n
+	help
+	  Virtual Secure Mode (VSM) is a set of hypervisor capabilities and
+	  enlightenments offered to host and guest partitions which enables
+	  the creation and management of new security boundaries within
+	  operating system software.
+
+	  VSM achieves and maintains isolation through Virtual Trust Levels
+	  (VTLs). Virtual Trust Levels are hierarchical, with higher levels
+	  being more privileged than lower levels. VTL0 is the least privileged
+	  level, and currently only other level supported is VTL2.
+
+	  Select this option to build a Linux kernel to run at a VTL other than
+	  the normal VTL0, which currently is only VTL2.  This option
+	  initializes the x86 platform for VTL2, and adds the ability to boot
+	  secondary CPUs directly into 64-bit context as required for VTLs other
+	  than 0.  A kernel built with this option must run at VTL2, and will
+	  not run as a normal guest.
+
+	  If unsure, say N
+
 config PARAVIRT
 	bool "Enable paravirtualization code"
 	depends on HAVE_STATIC_CALL
diff --git a/arch/x86/hyperv/Makefile b/arch/x86/hyperv/Makefile
index 5d2de10809ae..3a1548054b48 100644
--- a/arch/x86/hyperv/Makefile
+++ b/arch/x86/hyperv/Makefile
@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: GPL-2.0-only
 obj-y			:= hv_init.o mmu.o nested.o irqdomain.o ivm.o
 obj-$(CONFIG_X86_64)	+= hv_apic.o hv_proc.o
+obj-$(CONFIG_HYPERV_VTL_MODE)	+= hv_vtl.o
 
 ifdef CONFIG_X86_64
 obj-$(CONFIG_PARAVIRT_SPINLOCKS)	+= hv_spinlock.o
-- 
2.34.1


  parent reply	other threads:[~2023-03-20 10:05 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-03-20 10:03 [PATCH v3 0/5] Hyper-V VTL support Saurabh Sengar
2023-03-20 10:03 ` [PATCH v3 1/5] x86/init: Make get/set_rtc_noop() public Saurabh Sengar
2023-03-26 15:03   ` Michael Kelley (LINUX)
2023-03-27  4:47     ` Saurabh Singh Sengar
2023-03-20 10:03 ` [PATCH v3 2/5] x86/hyperv: Add VTL specific structs and hypercalls Saurabh Sengar
2023-03-26 15:05   ` Michael Kelley (LINUX)
2023-03-20 10:03 ` [PATCH v3 3/5] x86/hyperv: Make hv_get_nmi_reason public Saurabh Sengar
2023-03-26 15:06   ` Michael Kelley (LINUX)
2023-03-20 10:03 ` [PATCH v3 4/5] x86/hyperv: VTL support for Hyper-V Saurabh Sengar
2023-03-20 18:16   ` Michael Kelley (LINUX)
2023-03-21 11:27     ` Saurabh Singh Sengar
2023-03-20 10:03 ` Saurabh Sengar [this message]
2023-03-26 15:16   ` [PATCH v3 5/5] x86/Kconfig: Add HYPERV_VTL_MODE Michael Kelley (LINUX)
2023-03-26 16:47     ` Saurabh Singh Sengar

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